Verwenden Sie uniapp, um mehrstufige Verknüpfungsauswahleffekte zu erzielen

const data = [
  {
    name: '北京市',
    children: [
      {
        name: '东城区',
        children: [
          { name: '东华门街道' },
          { name: '东四街道' }
        ]
      },
      {
        name: '西城区',
        children: [
          { name: '西单街道' },
          { name: '西直门街道' }
        ]
      }
    ]
  },
  {
    name: '上海市',
    children: [
      {
        name: '黄浦区',
        children: [
          { name: '外滩街道' },
          { name: '南京东路街道' }
        ]
      },
      {
        name: '徐汇区',
        children: [
          { name: '徐家汇街道' },
          { name: '田林街道' }
        ]
      }
    ]
  }
];

<template>
  <view class="container">
    <!-- 一级选择器 -->
    <picker mode="selector" :range="{{provinceList}}" bindchange="handleProvinceChange" :value="provinceIndex">
      <view class="picker-block">
        <text>请选择省份</text>
        <text>{{provinceName}}</text> <!-- 显示选择的省份 -->
      </view>
    </picker>

    <!-- 二级选择器 -->
    <picker mode="selector" :range="{{cityList}}" bindchange="handleCityChange" :value="cityIndex">
      <view class="picker-block">
        <text>请选择城市</text>
        <text>{{cityName}}</text> <!-- 显示选择的城市 -->
      </view>
    </picker>

    <!-- 三级选择器 -->
    <picker mode="selector" :range="{{districtList}}" bindchange="handleDistrictChange" :value="districtIndex">
      <view class="picker-block">
        <text>请选择区县</text>
        <text>{{districtName}}</text> <!-- 显示选择的区县 -->
      </view>
    </picker>
  </view>
</template>

<style>
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.picker-block {
  margin-bottom: 20px;
}
</style>

<script>
export default {
  data() {
    return {
      provinceList: [],
      provinceIndex: 0,
      provinceName: "",
      cityList: [],
      cityIndex: 0,
      cityName: "",
      districtList: [],
      districtIndex: 0,
      districtName: ""
    };
  },
  mounted() {
    this.initData();
  },
  methods: {
    initData() {
      // 初始化省份列表
      this.provinceList = data.map(item => item.name);

      // 初始化城市列表
      this.handleProvinceChange({ detail: { value: this.provinceIndex } });
    },
    handleProvinceChange(e) {
      const index = e.detail.value;
      this.provinceIndex = index;
      this.provinceName = this.provinceList[index];

      // 根据选择的省份，初始化城市列表
      const cityData = data[index].children;
      this.cityList = cityData.map(city => city.name);

      // 初始化区县列表
      this.handleCityChange({ detail: { value: this.cityIndex } });
    },
    handleCityChange(e) {
      const index = e.detail.value;
      this.cityIndex = index;
      this.cityName = this.cityList[index];

      // 根据选择的城市，初始化区县列表
      const districtData = data[this.provinceIndex].children[index].children;
      this.districtList = districtData.map(district => district.name);
      
      // 初始化选中的区县
      this.handleDistrictChange({ detail: { value: this.districtIndex } });
    },
    handleDistrictChange(e) {
      const index = e.detail.value;
      this.districtIndex = index;
      this.districtName = this.districtList[index];
    }
  }
};
</script>